ASTM C1384-17 Standard Specification for Admixtures for Masonry Mortars.pdf

1、Designation: C1384 17Standard Specification forAdmixtures for Masonry Mortars1This standard is issued under the fixed designation C1384; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parenth

2、eses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification pertains to admixtures for masonrymortars. Admixtures are substances other than SpecificationC270 prescribed materials of water, agg

3、regate, and cementi-tious materials that are used to improve one or more of therecognized desirable properties of conventional masonry mor-tar.1.2 This specification does not cover coloring pigments.NOTE 1Information on coloring pigments can be found in Specifica-tion C979.1.3 This specification doe

4、s not cover additives that areadded to the cementitious materials during the manufacture ofthe cementitious materials.1.4 Acceptance of an admixture is based on its performancein an admixed mortar. Acceptance of the admixed masonrymortar is based on attainment of performance either equivalentto that

5、 required for conventional mortar or improved perfor-mance of one or more indicated properties, while maintainingrequired performance levels for other properties.1.5 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.NOTE 2The tes

6、ting laboratory performing the test methods referencedin this specification should be evaluated in accordance with PracticeC1093.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for t

7、heDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C91 Specification for Masonry CementC144 Specification for Aggregate for Masonry MortarC150 Specification

8、 for Portland CementC207 Specification for Hydrated Lime for Masonry Pur-posesC270 Specification for Mortar for Unit MasonryC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC403/C403M Test Method for Time of Setting of ConcreteMixtures by Penetration Re

9、sistanceC595 Specification for Blended Hydraulic CementsC723 Practice for Chemical-Resistant Resin Grouts forBrick or TileC778 Specification for Standard SandC780 Test Method for Preconstruction and ConstructionEvaluation of Mortars for Plain and Reinforced UnitMasonryC979 Specification for Pigments

10、 for Integrally Colored Con-creteC1072 Test Methods for Measurement of Masonry FlexuralBond StrengthC1093 Practice for Accreditation of Testing Agencies forMasonryC1152/C1152M Test Method for Acid-Soluble Chloride inMortar and ConcreteC1157 Performance Specification for Hydraulic CementC1180 Termino

11、logy of Mortar and Grout for Unit MasonryC1218/C1218M Test Method for Water-Soluble Chloride inMortar and ConcreteC1329 Specification for Mortar CementC1403 Test Method for Rate of Water Absorption of Ma-sonry MortarsC1437 Test Method for Flow of Hydraulic Cement Mortar1This specification is under t

12、he jurisdiction of ASTM Committee C12 onMortars and Grouts for Unit Masonry and is the direct responsibility of Subcom-mittee C12.03 on Specifications for Mortars.Current edition approved Dec. 1, 2017. Published January 2018. Originallyapproved in 1998. Last previous approved in 2012 as edition C138

13、4 12a. DOI:10.1520/C1384-17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section app

14、ears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Princi

15、ples for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.13. Terminology3.1 Terminology defined in Terminology C1180 shall applyfor this specification.3.2 Definitions of Terms Specific to This St

16、andard:3.2.1 admixed mortar, nmasonry mortar that deviatesfrom those combinations of materials recognized by Specifi-cation C270 in that it also contains an admixture.3.2.2 admixture, nsubstance other than the SpecificationC270 prescribed materials of water, aggregate, and cementi-tious materials th

17、at is added to a masonry mortar to modify oneor more properties of the conventional masonry mortar.3.2.3 bond enhancer, nadmixture used to increase thebond strength between the masonry mortar and the masonryunit.3.2.4 reference mortar, nmortar of the same compositionas an admixed mortar except that

18、the reference mortar does notinclude the admixture and may contain a different amount ofwater to obtain an equivalent flow or penetration as theadmixed mortar.3.2.5 set accelerator, nadmixture used to shorten the timeof setting of a masonry mortar.3.2.6 set retarder, nadmixture used to lengthen the

19、time ofsetting of a masonry mortar.3.2.7 water repellent, nadmixture used to decrease therate of water absorption of the hardened masonry mortar.3.2.8 workability enhancer, nadmixture used in a masonrymortar to increase the ease of being worked and used.3.2.8.1 DiscussionWorkability is a combination

20、 of severalproperties, including: plasticity, consistency, cohesion,adhesion, water retentivity, setting characteristics, and itscapacity to remain satisfactory under the influence of masonryunit suction and ambient environmental conditions. Many ofthese properties have defied exact laboratory measu

21、rement.The mason can best assess workability by observing theresponse of the mortar to the trowel and the masonry unit. Forfurther discussion on workability, see the Appendix of Speci-fication C270.4. Classification4.1 Admixtures are classified by their effect on the perfor-mance characteristics of

22、conventional masonry mortars. Ad-mixed mortars are classified by their modified properties, ascompared to a reference mortar. The following classificationsare recognized:4.1.1 Bond Enhancer.4.1.2 Workability Enhancer.4.1.3 Set Accelerator.4.1.4 Set Retarder.4.1.5 Water Repellent.5. Materials5.1 Ceme

23、ntsThe cement used in the evaluation of theadmixture shall conform to applicable requirements specifiedin 5.1.1 5.1.5.5.1.1 Cement, PortlandWhen the admixture is evaluatedin a mortar containing portland cement, the portland cementshall conform to the requirements for Type I, IA, II, IIA, III, orIIIA

24、 of Specification C150.5.1.2 Cement, Blended HydraulicWhen the admixture isevaluated in a mortar containing blended hydraulic cement, theblended hydraulic cement shall conform to the requirementsfor Type IS, IS-A, IP, IP-A, I(PM) or I(PM)-A of SpecificationC595.5.1.3 Cement, HydraulicWhen the admixt

25、ure is evaluatedin a mortar containing a hydraulic cement, the hydrauliccement shall conform to the requirements for Type GU, HE,MS, HS, MH, or LH of Specification C1157.5.1.4 Cement, MasonryWhen the admixture is evaluatedin a mortar containing a masonry cement, the masonry cementshall conform to th

26、e requirements of Specification C91.5.1.5 Cement, MortarWhen the admixture is evaluated ina mortar containing a mortar cement, the mortar cement shallconform to the requirements of Specification C1329.5.2 LimeWhen the admixture is evaluated in a cement-lime mortar, the hydrated lime shall conform to

27、 SpecificationC207.5.3 SandThe fine aggregate used in the tests will varydependent on the test procedure.5.3.1 Sands used for soluble chloride, flexural bond strengthand rate of water absorption tests shall be a blend of equal partsby weight of graded standard sand and standard 20-30 sandconforming

28、with Specification C778.5.3.2 Sands used for compressive strength, water retention,determination of air content of plastic mortar, board life, andtime of setting tests shall conform to the requirements ofSpecification C144.6. Chemical Composition6.1 The admixture shall not react adversely with embed

29、dedor attached materials common to masonry.NOTE 3Currently, there is no standard test method for determining thecorrosion potential of masonry mortars toward embedded and attachedmaterials. Nonetheless, the admixture shall not be offered for sale if themanufacturer has evidence that the admixture do

30、es react adversely withembedded or attached materials common to masonry.6.2 At the maximum recommended dosage, the mortaradmixture shall add not more than 65 ppm (0.0065 %) water-soluble chloride, or 90 ppm (0.0090 %) acid-soluble chlorideto the mortars overall chloride content as determined bytesti

31、ng of the reference and admixed mortars in accordancewith 9.1.1.7. Physical Properties7.1 All modified masonry mortars shall comply with theproperty specification requirements of Specification C270.Inaddition, the admixed mortars shall conform to all of thespecific classification requirements in Tab

32、le 1 for which theadmixture is obtaining qualification. Unless more specimensare required by a specific test method, a minimum of threespecimens shall be tested and the results averaged. These resultaverages shall meet the requirements of this section.7.2 Admixture compliance tests shall be the resp

33、onsibilityof the manufacturer of the admixture. These compliance testsC1384 172shall be completed within the past five (5) years and prior toany admixture composition change.8. Mortar Types and Proportions8.1 Design the reference mortar to be a specific type ofcement/lime, mortar cement, or masonry

34、cement mortar inconformance with the proportion specification of SpecificationC270 except that the aggregate ratio shall be fixed at threetimes the sum of the separate volumes of cementitious mate-rials. In addition, the aggregate shall meet the requirements in5.3.8.2 The corresponding admixed morta

35、rs shall have the samecomposition as the reference mortars but also shall include theadmixture, and the water content shall be adjusted to yield theflow or penetration appropriate for each test method. Theadmixture dosage rate, time of addition, and mixing sequenceshall follow the manufacturers reco

36、mmendations.8.3 A complete set of tests shall be run for all applicablecement/lime, mortar cement, and masonry cement types forwhich the admixture is to be qualified.9. Test Methods9.1 For all required tests, test both the reference mortar andthe admixed mortar in accordance with the following testm

37、ethods:9.1.1 Soluble Chloride ContentPrepare six mortar cubesin accordance with the specimen preparation section of TestMethod C1403 including the drying procedure, except thatmortar proportions shall be as specified in Section 8 andaggregates shall be as specified in 5.3. After 28 days of age,deter

38、mine the water-soluble chloride content of three cubes, aspercent chloride by mass of mortar, in accordance with TestMethod C1218/C1218M except increase the sample size to 15g instead of the 10 g specified in Test Method C1218/C1218M.Determine the acid-soluble chloride content of the other threecube

39、s, as percent chloride by mass of mortar, in accordancewith Test Method C1152/C1152M except increase the samplesize to 15 g instead of the 10 g specified in Test MethodC1152/C1152M.9.1.2 Compressive StrengthPrepare and test mortar inaccordance with Specification C270, except that mortar pro-portions

40、 shall be as specified in Section 8 and aggregates shallTABLE 1 Physical RequirementsABond Enhancer Workability Enhancer Set Accelerator Set Retarder Water RepellentCompressive strength,min % of reference:7 day 80 80 80 70 8028 day 80 80 80 80 80Water retention, min % ofreference: report 100 report

41、report reportAir content of plasticmortar, % report report report report reportBoard life, min % ofreference report 120 report 120 reportTime of settingB,allowable deviation fromreference, h: min:Initial: at least . . . . . . 1:00 earlier 1:00Clater . . .not more than 1:00 earlier nor 1:30later1:00

42、earlier nor 3:30later3:30 earlier 8:00Clater1:00 earlier nor 1:30laterFinal: at least . . . . . . 1:00 earlier . . . . . .not more than 1:00 earlier nor 1:30later1:00 earlier nor 3:30later. . . 8:00Clater1:00 earlier nor 1:30laterFlexural bond strength,min % of reference 110 . . . . . . . . . . . .R

43、ate of water absorptionmax % of reference 24h;28 days . . . . . . . . . . . . 50AThe values in the table include allowance for normal variation in test results. In addition to meeting the requirements in this table, all admixed mortars must meet theproperty requirements of Specification C270.BAll ti

44、me of setting tests shall be performed at 23 3C (73.4 5.4F), except those for set accelerators, which shall be performed at 5 2C (41 3.6F) as specifiedin 9.1.5.CThe manufacturers maximum recommended dosage rate shall be used when testing the initial and final set times for a set retarder.C1384 173be

45、 as specified in 5.3. Test three specimens at 7 days and threespecimens at 28 days.9.1.3 Water RetentionPrepare and test mortar in accor-dance with Specification C270, except that mortar proportionsshall be as specified in Section 8 and aggregates shall be asspecified in 5.3.9.1.4 Air Content of Pla

46、stic MortarPrepare mortar anddetermine air content of the plastic mortar in accordance withSpecification C270 except that mortar proportions shall be asspecified in Section 8 and aggregates shall be as specified in5.3. Calculate the air content to the nearest 0.1 % as follows:D 5W11W21W31W41W51VW!W1

47、P11W2P21W3P31W4P41W5P51VW(1)A 5 100 2WM4Dwhere:D = density of air-free mortar, g/cm3,W1= weight of portland cement, g,W2= weight of hydrated lime, g,W3= weight of mortar cement or masonry cement, g,W4= weight of sand, g,W5= weight of mortar admixture, g,Vw= mL of water used,P1= density of portland c

48、ement, g/cm3,P2= density of hydrated lime, g/cm3,P3= density of mortar cement or masonry cement, g/cm3,P4= density of sand, g/cm3,P5= density of mortar admixture, g/cm3,A = volume of air, %, andWM= weight of 400 mL of mortar, g.9.1.5 Board LifeTest mortar in accordance with TestMethod C780, Annex A2

49、 or, alternately, Annex A3, except forthe modifications in this section. The mortar proportions shallbe as specified in Section 8 and aggregates shall be as specifiedin 5.3. Prepare the mortar in accordance with the procedures ofTest Method C780, modifying those as appropriate when theadmixture is added to the mortar. Mix the mortar for 5 min,timing from when water and cementitious materials are com-bined or as recommended by the manufacturer. The mixer usedshall conform to that described in Practice C305, or to thatdescrib